SIPLUS HCS4200 RACK4200 FOR INTEGRATION OF MAX. 4 POWER MODULES (POM) POM4320. EACH POWER OUTPUT MODULE IS CONNECTED VIA DIRECT CONNECTOR ON A BUS BOARD, WHICH IS MOUNTED ON THE REAR OF THE SUBRACK. THE COMMUNICATION TO THE PLC IS CARRIED OUT BY THE CENTRAL INTERFACE MODUL (CIM) WHICH HAS TO BE MOUNTED ON THE LEFT SIDE OF THE RACK.